Comments for flags discoverability + add to debug log (ocornut#3795, o…

…cornut#4559)

imgui.cpp

@@ -4229,6 +4229,7 @@ static void StartLockWheelingWindow(ImGuiWindow* window)
     ImGuiContext& g = *GImGui;
     if (g.WheelingWindow == window)
         return;
+    IMGUI_DEBUG_LOG_IO("StartLockWheelingWindow() \"%s\"\n", window ? window->Name : "NULL");
     g.WheelingWindow = window;
     g.WheelingWindowRefMousePos = g.IO.MousePos;
     g.WheelingWindowTimer = WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER;
@@ -4246,6 +4247,7 @@ void ImGui::UpdateMouseWheel()
             g.WheelingWindowTimer = 0.0f;
         if (g.WheelingWindowTimer <= 0.0f)
         {
+            IMGUI_DEBUG_LOG_IO("UpdateMouseWheel() release WheelingWindow lock \"%s\"\n", g.WheelingWindow->Name);
             g.WheelingWindow = NULL;
             g.WheelingWindowTimer = 0.0f;
         }

imgui.h

@@ -947,6 +947,7 @@ namespace ImGui
 //-----------------------------------------------------------------------------
 
 // Flags for ImGui::Begin()
+// (Those are per-window flags. There are shared flags in ImGuiIO: io.ConfigWindowsResizeFromEdges and io.ConfigWindowsMoveFromTitleBarOnly)
 enum ImGuiWindowFlags_
 {
     ImGuiWindowFlags_None                   = 0,
@@ -984,6 +985,7 @@ enum ImGuiWindowFlags_
 };
 
 // Flags for ImGui::InputText()
+// (Those are per-item flags. There are shared flags in ImGuiIO: io.ConfigInputTextCursorBlink and io.ConfigInputTextEnterKeepActive)
 enum ImGuiInputTextFlags_
 {
     ImGuiInputTextFlags_None                = 0,
@@ -1678,6 +1680,7 @@ enum ImGuiColorEditFlags_
 
 // Flags for DragFloat(), DragInt(), SliderFloat(), SliderInt() etc.
 // We use the same sets of flags for DragXXX() and SliderXXX() functions as the features are the same and it makes it easier to swap them.
+// (Those are per-item flags. There are shared flags in ImGuiIO: io.ConfigDragClickToInputText)
 enum ImGuiSliderFlags_
 {
     ImGuiSliderFlags_None                   = 0,